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Remove gas line from regulator, put your finger over outlet port and try the test again. If that holds, then do the same with line attatched to regulator but not to welder. Maybe the hose has a problem. It could be something not letting the solenoid valve to fully seat also. With the hose connected to welder, put regulator end in your mouth and draw a vacuum and block with tongue and see if that holds. That is one of the easiest ways to check for leaks in items that have very small volume.